Preheat oven to 440-degrees. Put all ingredients in a 9 x 13 baking, or a pan large enough to hold everything. Toss all to mix well. Bake 40 minutes. Turn and stir potatoes, and, sprinkle with a little more oregano. Add the other ½ cup water. Return to oven and bake another 40 minutes. Remove from oven, and let rest for about 5 minutes. Serve.